      vb3.0.x   vb3.5.x
        vb3.0.x

   includes/class_postbit.php
  :

$this->post['signature'] = $this->cache['sig'][$this->post['userid']];

  :
//$this->post['signature'] = $this->cache['sig'][$this->post['userid']];
$this->post['signature'] = '';

  

         
    Milad      vb3.0.x